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What's included
your discount will be applied at checkout


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Our testosterone test measures your total testosterone levels giving you insight on how it could be affecting your energy levels, bone health, mood, libido, and muscle growth.
What's included
your discount will be applied at checkout

Why measure
Testosterone levels?

Our home testosterone test measures total testosterone which is a combination of free and bound testosterone. Testosterone is an essential male hormone integral to multiple functions in the body including energy, bone health, mood, libido and muscle growth. Our convenient testosterone test kit will identify if your levels require improvement. 

When to take This test

Testosterone levels are at their peak first thing in the morning, so it's best to collect a sample for the testosterone test between 8am - 10am.

In Men

Testosterone in men is an important sex hormone which regulates libido (sex drive), body mass, strength as well as being involved in the production of red blood cells and sperm.

As men get older, the amount of testosterone they produce falls. Some of the testosterone in men is converted to another hormone called oestrogen (specifically oestradiol). Oestradiol helps with libido and erectile function and so, as testosterone levels drop, so too does the level of oestradiol.

It’s not just age though that can reduce testosterone production. Overtraining and/or under fuelling in exercise can also result in low testosterone levels.

Several symptoms can arise from low testosterone in men including low mood, fatigue, difficulty sleeping, low libido, difficulty gaining muscle mass and predisposition to gain fat. Low testosterone is also associated with an increased risk of injuries such as stress fractures which may have significant consequences in older men but can also impact upon your usual daily routine including exercise and training.

A high testosterone blood test result can affect fertility by causing a low sperm count. A high intake of steroids to aid sports performance can also stop the body producing testosterone. 

Testosterone Level
32% of men
who tested with Forth had levels below the normal or in the lower part of the normal range.
Male and Female Average

In Women

Our testosterone test isn’t just for men. Women also produce testosterone in smaller amounts and it is involved in female sex drive and the health of the bones, breasts, vagina, and menstruation.

Low levels of testosterone in women can cause missed or irregular periods, osteoporosis, decreased libido, vaginal dryness, and infertility.

High levels of testosterone in women can indicate can be caused by Polycystic Ovary Syndrome (PCOS).

Testosterone and Exercise

Some exercises initially increase testosterone levels but this is usually only for a brief period. However, there is a fine balance needed for healthy testosterone levels. For example, intense training without adequate rest and recovery can cause a significant reduction in testosterone levels and overtraining syndrome.

You may be at risk of overtraining syndrome if your are experiencing symptoms such as fatigue, low motivation, depression and a slow heart rate.

Testosterone has vital roles in muscle mass and strength as well as being vital for maintaining bone density. So, low testosterone can increase the risk of fractures which will negatively impact your training.

Because of the hormone’s role in muscle mass, if testosterone levels are too low, your body may start to break your muscles down to extract energy. Ultimately, this will affect your overall performance.

improve your unique self

Want to improve your health & wellbeing? Forth gives you insight into your body’s key biomarkers. By tracking essential markers overtime you can build a picture of your own unique self and discover how your body responds to the changes you make so you can reach your personal best.

Chose a health check

Order your home blood test online and we’ll deliver it straight to your letterbox.

Collect your sample

Our finger prick blood test kit has everything you need. Just collect your sample, and return it to our accredited lab, using the Tracked-24 envelope supplied.

Fast, accurate results

Your blood test results will be reviewed by our healthcare team and uploaded to your dashboard within 24-48hrs. Along with simple explanations and expert advice on how to make improvements.

Health Dashboard

View your results on our app and web platform, which gives you key information, bespoke advice, and allows you to dive deeper to find out more.

Advice by medical experts

We don’t just provide your levels and leave you to it; our team of medical experts interpret any out-of range results and provide advice specifically tailored to you.


Our app allows you to compare your biomarker results against other individuals of a similar age and gender, so you’re able to benchmark your health more accurately, and identify any areas that need improvement.

Track changes over time

One test is a snapshot, but test repeatedly over time and you’ll see how your body reacts, adapts and changes to elements like diet, exercise, supplements, and more. The more information you have, the clearer the picture of your own unique physiology, and the greater your understanding of what your body needs to perform at its best.

Fast & Accurate

Fast & accurate analysis from accredited laboratory.


Secure access to online results.


Convenient tests can be done at home.

Online Dashboard

Online dashboard which tracks results over time.

Frequently asked questions

Take the guess work out of your health. Here are some of the most frequently asked questions we get asked. If you need anything else try our help section.

  • What is testosterone?

    Testosterone is a male sex hormone also known as an androgen. It has a vital role in the sexual development of men, particularly sperm production as well as regulating bone and muscle mass.

    It’s also an important hormone in women and is responsible for regulating their sex drive too as well as regulating bone and breast health amongst other things.

    Testosterone levels are controlled by the brain and pituitary gland and once it has been made, it is transported by the blood to the various parts of the body which require it to function.

  • How to check testosterone levels?

    Our testosterone blood test measures your total testosterone level and it’s really simple to do.

    Once you have purchased your test online it will arrive in a box that easily fits through your letterbox. The kit contains everything you need to carry out your finger-prick blood test at home, complete with detailed instructions. Once you have collected the sample for your testosterone test, simply put it in the pre-paid envelope and post back to us. The tests are carried out by our accredited labs and reviewed by a GP or nurse. Your results will be available on your Forth dashboard within 2 working days of receipt.

  • What are the signs of high testosterone?

    Some men are genetically predisposed to increased testosterone. An increased testosterone count in men can be caused by adrenal or testicular tumours. Even harmless tumours, known as benign, can increase testosterone levels. Signs of high testosterone in men include:

    • Aggressive or irritable behaviour
    • Acne
    • Oily skin
    • Sleep apnoea
    • low sperm count

    Taking too much testosterone replacement therapy can also result in a high level and may be accompanied by some of the unpleasant side effects. Increased testosterone also raises cholesterol levels which can put  men at greater risk of  heart attacks and stroke.

  • What is polycystic ovary syndrome (PCOS) in women?

    PCOS affects the function of the ovaries in women. It is a common condition where there is an increased production of follicles and testosterone. Within these follicles, eggs develop but are not released. That means ovulation doesn’t occur and can make it difficult to conceive.

    Approximately one fifth of women in the UK have PCOS and almost half experience no symptoms.

  • What is testosterone free and total testosterone?

    Two types of testosterone can be tested, free and total.

    Most testosterone molecules bind with sex hormone-binding globulin (SHBG) or albumin. This is known as bound testosterone.

    Free testosterone, however, isn’t attached to any other molecules in the blood and so is readily available for use by the body. Total testosterone measures the combined amount of free and bound testosterone. So, your total testosterone level will always be greater than your free level.

  • What is the normal testosterone level for men?

    The normal testosterone level for men is between 8.65 nmol/L and 29 nmol/L.

  • Does testosterone increase when you work out?

    Exercise initially increases testosterone levels when you workout but the effects may not be long-term.

    There are specific types of exercise which can help to support the production of testosterone, particularly strength and resistance-based exercises.

  • Do I need to take a testosterone supplement if my level is low?

    TRT should only on the advice and guidance of a medical doctor. For those competing in sport, testosterone is on WADA banned list.

  • How can I get my testosterone level up?

    Taking part in strength and resistant type exercise can help with the production of testosterone. Other factors which can support testosterone levels are getting good quality sleep, eating a healthy balanced diet, losing weight if you’re overweight and reducing stress.

  • How do I know if I have PCOS?

    You will need a diagnosis from a registered medical professional, but a high testosterone level can be an indicator of PCOS. You may also experience symptoms like excessive hair growth, irregular periods, weight gain and difficulty conceiving. The condition also increases the risk of type 2 diabetes.

Upgrade your test

All our tests are designed by our expert team of scientists who have taken the latest research to bring you the most relevant biomarkers to improve your health. Here are some alternative tests that cover essential biomarkers.

Male Hormones
12 Biomarkers Included
At home hormone test including testosterone to check for any imbalances.
48 Biomarkers Included
Our best value wellbeing check measuring over 45 biomarkers.
Looking for a bespoke test?

Want to add more biomarkers to your test? That’s no problem. All of our tests can be personalised.  Just use our ‘customise this test’ button below to see the list of biomarkers which you can add to your test and get analysed at the same time. 


If you are an employer and would like to order multiple tests for your employees, please complete the form below.